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Finding the Fourth Proportional to 128,386, 177,173.29 and 71,797.38

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Solution

The fourth proportional to 128,386, 177,173.29 and 71,797.38 is: 99,080.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,386 : 177,173.29 = 71,797.38 : x
  2. Step 2: Convert to fraction form
    128,386/177,173.29 = 71,797.38/x
  3. Step 3: Cross multiply
    128,386x = 177,173.29 × 71,797.38
  4. Step 4: Simplify right side
    128,386x = 12,720,578,027.98
  5. Step 5: Solve for x
    x = 12,720,578,027.98/128,386
  6. Step 6: Final answer
    x = 99,080.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.